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PagedList.cs

namespace Nop.Core;

/// <summary>
/// Paged list
/// </summary>
/// <typeparam name="T">T</typeparam>
[Serializable]
public partial class PagedList<T> : List<T>, IPagedList<T>
{
    /// <summary>
    /// Ctor
    /// </summary>
    /// <param name="source">source</param>
    /// <param name="pageIndex">Page index</param>
    /// <param name="pageSize">Page size</param>
    /// <param name="totalCount">Total count</param>
    public PagedList(IList<T> source, int pageIndex, int pageSize, int? totalCount = null)
    {
        //min allowed page size is 1
        pageSize = Math.Max(pageSize, 1);

        TotalCount = totalCount ?? source.Count;
        TotalPages = TotalCount / pageSize;

        if (TotalCount % pageSize > 0)
            TotalPages++;

        PageSize = pageSize;
        PageIndex = pageIndex;
        AddRange(totalCount != null ? source : source.Skip(pageIndex * pageSize).Take(pageSize));
    }

    /// <summary>
    /// Page index
    /// </summary>
    public int PageIndex { get; }

    /// <summary>
    /// Page size
    /// </summary>
    public int PageSize { get; }

    /// <summary>
    /// Total count
    /// </summary>
    public int TotalCount { get; }

    /// <summary>
    /// Total pages
    /// </summary>
    public int TotalPages { get; }

    /// <summary>
    /// Has previous page
    /// </summary>
    public bool HasPreviousPage => PageIndex > 0;

    /// <summary>
    /// Has next page
    /// </summary>
    public bool HasNextPage => PageIndex + 1 < TotalPages;
}